Design of a 1-MHz high-efficiency high-power-density bidirectional GaN-Based CLLC converter for electric vehicles

Peiwen He, Ayan Mallik, Arun Sankar, Alireza Khaligh

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

In this paper, a bidirectional CLLC converter operating at MHz-level switching frequency is proposed to achieve high power density and high efficiency. An optimized stacked printed circuit board winding based planar transformer with adjustable leakage inductance is modeled and designed for the proposed converter. It is enabled using gallium nitride devices to achieve fast switching with low switching losses. A detailed power loss model is established for the efficient thermal design of the converter. A proof-of-concept hardware of 3.3 kW, 400-450 VDC input, 250-420 VDC output CLLC converter with 1 MHz operating frequency is built and tested over a wide range of loading conditions. The power density of the system is 9.22 W/cm3 (151.1 W/in3) and the peak efficiency achieves over 97%.

Original languageEnglish (US)
Article number8534460
Pages (from-to)213-223
Number of pages11
JournalIEEE Transactions on Vehicular Technology
Volume68
Issue number1
DOIs
StatePublished - Jan 2019

Keywords

  • Bidirectional
  • CLLC
  • DC-DC conversion
  • MHz
  • electric vehicle
  • high power density
  • planar transformer

ASJC Scopus subject areas

  • Automotive Engineering
  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Applied Mathematics

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